Assigfoe of one-half to



(No Model.)

M. C. ARMOUR.

UNITED STATES PATENT OFFICE.

` MICHAEL C. ARMOUR, OF CHICAGO, ILLINOIS, ASSIGNOR OFONE-HALF TO THE ADAMS 8L VVESTLAKE MANUFACTURING'COMPANY, OF SAME PLACE.

EXTENSION-TOP FOR OIL AND GAS STOVES.V

SPECIFICATION forming part of` Letters Patent No..249,287, dated November 8, 1881.

Application filed March 7, 1881. (No model.)

To alt whom t may concern:

Beit known that I, MICHAEL C. ARMOUR,`

a citizen of the United States, residing in the city of Chicago, in the county of Cook, in the State of Illinois, have invented certain new and useful Improvements in Extension-Tops for Oil and Gas Stoves, which are fully set forth in the following specilication, reference being had to the accompanying drawings, in which- Figure l is a top-plan view of an extensiontop havin g my improvements, the center piece and covers being removed. Fig. 2 is a` section of thesame on the-linexmin Fig. l. Fig. 3 is a plan view of the cover, which eonsitutes a part of my improvements.

The same letters denote the same parts in all the gures.

My invention relates to the extension-tops which are attached to oil and gas stoves to support the cooking utensils and conduct heat to them. It has been found im practicable to support the vessels on these tops in the same way as on wood or coal stoves, by setting them in holes whose edges support the vessel, inasmuch as closing the top so tightly as is thus doneY stops up the only convenient outlet for the products of combustion, and thus smothers the llame.

The object of myinvention is to obviate this difficulty; and it consists in arranging within the cavity of the top supporting-ridges extending above the margins ofthe vessel-openings, so that when thevessels are placed on these supports there will be room for a circulation of gases under them andV over the edges of the openings.

It further consists in the special devices embodying this principle, which will be fully described hereinafter, and definitely pointed out in the claims.

In the drawings, A denotes the central opening in the extension-top, through which the tiame and gases rise from the burner. It is here represented as circular in form.

B denotes the dat upper surface or rim,which at each end narrows so as to be merely an i n complete ring bordering the cavity C, over which the vessels are to be set. Where it borders on'the central opening it is cut away to form the steps b, which support the center 5o piece,which covers the space between the openings for the vessels when the stove is in use. The bottom ot' each cavity C `curves upward from the edge of the central opening, A, to a level a little below that of the upper surface, B. On this bottom are formed ridges D, extending in length from the margin of the central opening nearly or4 quite across the cavity C. They are arranged parallel and near enough to each other to give a firm support to any ves- 6o sel that may he set on them. A re-eutrant curvature in the upper edge of each gives room for additional circulation of the heated currents under the vessel. By making the lower part ofthe vessel of less diameter than the vesselopening the necessity of extending the ridges above the margin of the opening would be removed. When the ridges are so extended, I use 'for closing either of the holes the cover E,

(shown in Fig. 3 ofthe drawi ngs,) provided with 7o O slots e, corresponding tothe ridges, so that it maybe set down close on the rim B, the ridges passing through it and combining with it'to close the opening. By closing one of the holes in this way the heat will be deflected to the other. Closing both at the same time would smother the iiame.

What I claim as my invention, and desire to secure by Letters Patent, is-` y 1. An extension-top for oil or gas stoves, pro- 8o vided with ridges arranged Within the vesselopeuin g and extending above its margin, substantially as and for the purpose described.

2. An extension-top for oil or gas stoves, provided with ridges D, arranged within the vessel-opening, extending above its margin, and re-entrantly curved on their upper edges, substantially as and for the purpose described.

In combination with the ridges D, the slotted cover E, both constructed, arranged, 9o and operating substantially as and forthe purpose described.

MICHAEL C. ARMCUR.

Witnesses:

JN0. '0. MAGGI-meen, MINNIE B. GAGE. 

